Amtrak operates train stations and Amtrak Thruway transit hubs throughout the United States. All current and most former Amtrak train stations and Thruway Motorcoach stops have a three-letter station code. These codes do not necessarily correspond with the list of IATA-indexed train stations or the three-character IATA airport codes, although many are the same. Amtrak began using station codes in 1992. If a station code was used by more than one train station, each station is listed. However, if a station code was used for a Thruway Motorcoach stop that has changed locations, only information for the current location is included in the notes, unless one of the locations was an actual train station.